p172 If we wish to avoid falling under the influence of delusion we must guard our mind and prevent it from wandering.

If we wish to avoid falling under the influence of delusion we must guard our mind and prevent it from wandering. We cannot practice moral discipline purely if we have an unguarded mind. If we can learn how to protect our mind from delusion and yoke it to the practice of virtue, our moral discipline will grow in strength and eventually be perfected. If we neglect to guard our mind, however, many faults will arise.